1. To access Integration settings, just click Settings > Integrations in the sidebar menu. 

2. Once you're there, you'll see various software categories and be able to locate Basecamp under Project management tools.

3. Click the pink 'Connect Basecamp' button and follow the instructions to log in to your account

4. Once you're logged in (or if you're already logged in), you'll be sent back to a page that looks like this which confirms that you've connected your account.

Simply click on the document you want to create a project for and click the 'create project' button on the right hand side. 

In the sidebar that opens, give your project a name, enter a description and click 'Create Project'. 

Once the project has been created, the button will change to say 'view project' so you can access it directly from this page any time you need.