Here's the link to a post which includes several player's samples.
Open your galaxy map as a text file (right click and "open with...". Notepad works fine.
The problem you're having is that Galaxy Forge isn't quite functional for templates--it almost gets them but they go in wrong--so you have to hand edit them.
There are three ways to change templates--as a mod editing the GalaxyScenarioDef.entiry, using the same style of templates in a planet's info in the galaxy file or adding templates to the bottom of the galaxy map and changing text on the planets in the map to point to them. The link I posted has samples of most of these.
If you want to make it a mod--just copy the GalaxyScenario Def.entity file into a folder titled MOD, then create another folder inside it named GameInfo and put the GSD in there.
Harpo has text converted reference files.
Use the examples on the page I linked to see how to hand edit them into your maps.
It's not as complicated as it sounds but GF will break them and typos or missed entries/characters will too--so relax and pay attention when you're typing. You can't put any planet modules at a world not owned by the player/factions. Ships--yes, Modules--no.
Post back if you need more help. I'd recommend start with templates at the page bottom--it's a lot easier to fix them then. Also, run the game in dev mode--it will tell you where a problem is.
Usually it will say the problem is "line # so-and-so" and that usually means the area directly ABOVE that line is what isn't done right. Notepad++ is a free text editor that will count the lines for you.
Another great little helper--especially when you're doing a lot of copy-pasting is Deskpins. Works great and uses practically no memory at all. Both of these are free.
One thing you might not realize--to use the "bottom templates" text has to be edited at the planet where the template applies as well as in the template itself. Use my sample for a "clean" snippet of this.