The first step that you need to take when managing packages in a project is opening the project itself and there are multiple ways to do this.
First Method: Press Ctrl + O on your keyboard.
Second Method: Click File and then Open Project on the menu bar.
Third Method: Go to the Project Specific Packages Tab and click the Browse button.
After following any of the method above, the open file dialogue box will appear. Head to the directory of the project and select the *.rpgproject file. Afterwards, you will receive a confirmation saying the project has been opened.