When you login you may end up on your projects list. If your page doesn't look like this, click the "projects" menu item to get to the list. The projects list should look like this - see below.
Step 3: Start the collaboration process
Click the three dots (...) at the top right of the line with the project you want to share, and choose "collaborate" (see below)
Next, start entering the user's myID or their name, and then when their information pops up, select their name. (see below)
After you select their name, it will appear in the add box. Then click the blue "Add" button. (See below)
After you click to add then, another pop up will appear where you can add a message, then click "OK". When you share a form with a person, they will get an email that allows them to gain access. You might want to include a message so the person knows why you are sharing the form with them. See below.
Step 4: Set Permissions and Save
Now you need to decide the permissions you want to give them. By default all permissions are selected. Unselect any you don't need, and then click "Save"
Now the other individual will be able to manage the project the same as you.