Hi Riebe,
Some say that using a RTV for an application like this isn't necessary, however, I usually use Permatex Ultra Black (same thing, different name). I use it on the tube seals and on the gasket. Just be sure you don't use so much that it makes a mess under the valve cover. You got this!
Here is a guide to help step by step with diagrams below to show you how on your car
https://www.2carpros.com/articles/replace-valve-cover-gasket
Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
Images (Click to make bigger)
Saturday, March 2nd, 2019 AT 4:49 PM