Follow these steps to add parts to your Altium Designer through the SnapEDA Plugin:
On the home page in Altium select File > Add Part or simply click on the SnapEDA Icon.
The SnapEDA Plugin window will open, make sure you are logged in to your account by hovering over the login icon on the top right corner.
Search for the part you want to download, select the part, and click Download.
Select one of the two available options:
This will allow you to place the part directly into your Schematic Project.
Note: These files will be saved in the SnapEDA_Library.IntLib folder which you can access by clicking on the Place part button.
Add to Library:
With this option, the sources will be extracted so you can manually edit the symbol, footprint, and 3D model if needed.
Note: These files will be placed with the Free Documents under your Projects tab on the Left.