[KiiD]

depends on the script you're using, if it's for example, a roleplay script it will most likely have an admin system set in place, if so find the highest admin level in your script, leave the server then go into your scriptfiles, and find the location of the user data, may be different once again depending on what script you're using. Anyway, once you've found the users, then your account name edit it and find a line looking like "Admin:" or something along those lines then put in that number you saw earlier. Usually it's one of the following: 6, 1337, 1338 or 9999.

However if the script doesn't have an admin/level system find the rcon password in your server.cfg, found in your servers file directory find the "rcon passwrod" line, then go ingame and type /rcon login [password], for other rcon commands you can go here:
https://sampwiki.blast.hk/wiki/Advanced_...ols#Using_RCON