how do I add addons to my server?

Hey user, what game server do you have?

He has garry's mod server.

To add addons on yuor server, you need:

1. Download plugin zip archive.

2. Extract this zip archive to server in folder garrysmod/addons

You can read about it here: click

Or You Can Download Winscp And Connect Go To garrysmod/garrysmod/addons And Put Them In There

Also you can make Collection and paste last numbers from you're collection link