Go to "Project Setup"
Click on "Online Designer" (circled in Red below)
Next click on "Import" tab (circled in red below)
You'll now be on the REDCap Shared Library page, where you can select and import an already existing form. It looks similar to this:
Click on the form you would like to use, and select "Import into my REDCap project" (circled in Red below)
You now will need to agree with things listed in an agreement, once that is done a box similar to the one below will show up. Here you can change the name of the form and add it to your project.
The form is now added. You can edit and made changes to the form if you want

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