[Konstantinos]

Replace this

pawn Код:

format(str, sizeof(str), "You jailed %s for %d mins.", GetPlayerName(playerid, const name[], len), mins);

To

pawn Код:

format(str, sizeof(str), "You jailed %s for %d mins.", Name2, mins);

Also, this

pawn Код:

format(str, sizeof(str), "%s jailed you for %d mins.", GetPlayerName(playerid, const name[], len), mins);

To

pawn Код:

format(str, sizeof(str), "%s jailed you for %d mins.", Name, mins);

Last,

pawn Код:

format(str, sizeof(str), "Administrator %s has jailed %s for %d mins!", GetPlayerName(playerid, const name[], len), GetPlayerName(playerid, const name[], len), mins);

To

pawn Код:

format(str, sizeof(str), "Administrator %s has jailed %s for %d mins!", Name, Name2, mins);

These are the parameters

pawn Код:

GetPlayerName(playerid, const name[], len)

So, you make a new variable with MAX_PLAYER_NAME.

pawn Код:

new
    Name[ MAX_PLAYER_NAME ];

GetPlayerName( playerid, Name, sizeof( Name ) ); // We get the Name from the player and we store it to `Name`

On the format messages, you have to use "%s" -> Name.
It will show the name.