UEx provides a way for you to mark and quickly access lines of interest in your files via bookmarks.
To add a bookmark, make sure the cursor is positioned on the line you'd like to bookmark. Press Ctrl + D to add the bookmark. You should see the corresponding line number highlighted to indicate it is bookmarked. To jump to the next available bookmark, press F6. To jump to the previous bookmark, press Alt + F6.
If you ever need to reset or clear all of your bookmarks, you can do so by going to the Search menu and selecting "Clear All Bookmarks".