I saw where someone mention a bleeder bolt for filling the radiator in a Nissan frontier I have a 2001 Nissan frontier supercharged can someone tell me where to bolt is exactly

The bleeder is to remove trapped air. If you Google "2001 Nissan Frontier Bleeder Bolt", actually a tube I believe, you will find a lot of hits. Bleeding is necessary on many engines when the engine sits higher than the Radiator. Nissan actually makes a special filler tool.