Before you can do anything in a.c.pro, you either need someone in an organization to create an account for you, or you need to create your own account and your own organization. The first section below will walk you through creating your own account and organization. If you have already done that, or if an administrator in another organization has already given you an account, you can skip to the section on creating new users.
To be an a.c.pro user, you need a user account. To have a user account, you need to belong to an "organization" in a.c.pro. If you are completely new to a.c.pro and are not part of an organization that can create a user account for you, you can both create your own organization and your own user account in one step.
At the a.c.pro login screen, click the "Login" button without entering any user ID or password. This takes you to the a.c.pro sign-up screen:

Give yourself an a.c.pro user ID and password and type in your name and e-mail address. In the final field, Organization, type your company name or some other name that refers to you and the group of people with whom you will be working on projects in a.c.pro. Then click the "Sign me up" button to register.
If you have selected a user ID that is already in use in a.c.pro, you will receive this warning and you will have to choose a different ID:
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After you have successfully signed up, you will immediately be taken to the a.c.pro welcome screen, which displays a set of links to perform other activities:

Note the "Users" link. In the next section you will use that link to setup additional a.c.pro accounts for the other members of your organization.
At this point, you have your own account -- either setup by yourself following the steps above or by an a.c.pro administrator for your organization -- and you now wish to setup other users. To do this, you must also be an a.c.pro administrator for your organization. If you received your account by following the steps in the previous section -- which included creating an entirely new organization -- then you are automatically the administrator and you can add other users. If, on the other hand, you received your account from another a.c.pro administrator in your organization, then you need to be sure he also made you an administrator if you want to do things such as add other users and create new projects. Standard, non-administrative users can do little more than work on individual project items.
There is one very simple way to determine if you are an administrator. After you login to a.c.pro, if the welcome page includes a "Users" link, then you are an administrator and you can setup accounts for other people.
So to begin creating other users, click the "Users" link on the welcome page. This will show you the list of users in organizations of which you are an administrator. If you just signed up for a.c.pro and created your own organization, then you will only see yourself in the list.

Create a new user by clicking the "New" button, which takes you to the "Add User" screen.
As this is a Quick Guide to get your team up and running, we will point out only the most important fields to fill out for your new user.

At a minimum, type in a user ID, password, First Name, Last Name and Email for your new user. When ready, click "OK" to save these settings. Then, if you already have some projects, you will be presented with a screen where you can check-off the projects to which you want to grant this new user access. If, however, you just created your own account and your new organization, you do not yet have any projects, so you will not see this screen.
Repeat these steps for as many new users as you wish to create.
Once your team of users is setup, you should then go on to create your first project.