So I was creating a medieval version of the laser rifle, however I cannot seem to equip it to any of my characters. I know it says that you decide about firearms as a proficiency, but I cant seem to find where that would be ont he sheet to activate it to allow me to equip the item. Help?

You do not need proficiency to equip something. Did you add the item to your inventory? If you are saying that you cannot find it to add it, then is “Homebrew Content” enabled for the character? On the “home” tab of the character creator, the toggle next to “homebrew content” needs to be on (red).

So I made two homebrew items, one i could add- a crossbow (a dummy test), and one I couldn't- the laser rifle. I made sure homebrew was active and I tried putting the character into a campaign where one of the player has bought everything so any restrictions should be off, but still cant attach the laser rifle. Not sure whats going on

Well, it could be a couple of things.

Your character is most likely not proficient with laser rifles. So, when you go to “manage equipment” you will have to double check that the “proficient” box is not checked, or it will not present it as an option.Alternatively, it might just be because of technical issues that have nothing to do with what it is.

Are you sure that the laser rifle is in your “collection?” Did it accidentally get removed? If so just add it back and be patient, maybe 15-20 minutes maximum, probably less. If that’s not it....

Try re-saving the whole laser rifle. That will trigger the system to pick up the newest version of the item. Then just wait about 15-20 minutes and try again. That will give the system enough time to push the new info to the character sheet.

Or, if that doesn’t work, log out, log back in, and then wait another 15-20 minutes. That will trigger the server to clear its cache and push new data. 

Aww yes it was the proficiency tick- my bad. Thank you for all your help.