To add resources to an activity, open the Table View from the left panel.

Navigate to the Resources Tab from with-in the Table on top left
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Scroll to the desired activity
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Select the Labor or Equipment cell in the table of that activity
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Press [+] icon or start typing the name of the resource
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Resources from the library will show up as your type. Specify quantity and Add
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If the resource you specified doesn't exist in the library, you can create it by clicking on +Create labor at the bottom of the popup
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Once the new resource is created, it is automatically added to the resource library and can be used in all your projects.