[ThePrograme]

I do't know how to make this anybody who can show me how

pawn Код:

FormatSkinList(playerid)
{
    new
        list[ (MAX_SKIN_NAME + 1) * TOTAL_SKINS];

    for(new i; i<TOTAL_SKINS; i++)
    {
        if(!IsValidSkin(i))continue;
        strcat(list, GetSkinName(i));
        strcat(list, "\n");
    }
    
    ShowPlayerDialog(playerid, DIALOG_ID, DIALOG_STYLE_LIST, "Skins", list, "Save Skin On", "Save Skin Off");
}

Your code may require some assembly (No that's not a pun)
Requirements:

function IsValidSkin(skinid)
function GetSkinName(skinid)
constant TOTAL_SKINS (I think it's 300)
constant MAX_SKIN_NAME