We are super happy to have help from people on the Wiki. As well as Venus, it needs many pages updating with new Galacticraft 4 info, and most pages could be improved with more images and screenshots. This could help a lot of people.
(Don't worry about doing something wrong! The admins can see which Wiki pages have been edited, and can fix up anything which isn't right. And the critical pages are protected.)
You need an account on the Wiki to edit. The Wiki should give you the option to create an account. If you have a problem with that, please PM micdoodle8 - it's possible that new accounts need manual approval currently, but I'm sure he will approve you.