- Click on the user’s company on the left side of the window.
- Select the project from the Projects section.
Scroll down the page to "Users" below the Integrate section. Click on "Manage Project Users"
In the left-hand column, click the orange plus icon on the left-hand side of the user’s name, or drag and drop the user name from the left column to the right.
If you have administrator rights for multiple companies, you will be presented with the options to add the users from each company you have administrator access to. If you are adding users from multiple companies, make sure to click on the company name to expand it and see the users inside.
Then click "Close".