Here is my problem, I put some mod on my Rust server but to use them I must have permission to use the command "oxide.grant" or even "oxide.show" but I am not allowed to use . I am well recognized as an admin on my server but not by oxide, what can I do?

hi in the file users.cfg (/games/rust/server/host/cfg)  put ownerid steam id and restart the server

Regular players are auth level 0. Mods should be given auth level 1. Admin/owners are auth level 2. You need auth level 2 to run oxide console commands.

Are you listed in the server\servername\cfg\users.cfg file? ownerid 76561198377301192 "unnamed" "no reason"   
If not, add yourself; it'll require a server restart.

(Did you run Rust with the correct Steam account? Some admins have a non-admin Family Share account for testing and sometimes I've accidentally logged in without re-signing into Steam with the correct account. Probably not it but wanted to mention this.)

That it's good? ownerid 76561199029924973 "Fracamos" "no reason"
                        moderatorid 76561199029924973 "Fracamos" "no reason"

The computer reads that like this:
....4973 now has auth level 2!
....4973 is now level 1! Overwritting permission to a lower level!

Remove the moderator id line and restart the server. Auth level 2 has everything 1 and 0 has. Auth level 1 has everything level 0 has. Auth 0 (called default) only has default group permissions.

ok it's good thank you