how do u charge a glow plug starter

The hobby stores sell a 1.5 volt charger for it.

If you are talking about one of these or similar
http://www2.towerhobbies.com/cgi-bin...&I=LXJGS6&P=ML
you can see that a charger comes with many of them. If you have lost your charger, you can buy one separately
http://www2.towerhobbies.com/cgi-bin...?&I=LXD701&P=7
Some power panels also have a place to charge ignitors
http://www2.towerhobbies.com/cgi-bin...&I=LXACW7&P=ML
as seen in the lower left corner of the above panel.

Most of the glow drivers out there comes with the charger when you buy it. The ones that Bruce listed are great examples and a good buy.

Hope this helps

Ken