Logic

1. Click the + icon in the top left corner of the track list
2. Make sure Software Instrument is selected in the pop-up window and make sure the Open Library option is deactivated and then click Create.
3. Click the Instrument slot for the channel you just created and select the path **AU Instruments -> XLN Audio -> and select your plug-in.

Watch the video below for a visual guide:

If you are experiencing issues with finding your plug-ins in Logic, then please have a look at this article:

Plug-ins not showing up in Logic pro-x