GCLD help

Hi,
so im new to all of this and i might get someof the turms wrong but ill do my best. I have a font open in GCLD font maker and it is converted and fin and everything. font range is 0 - 70 and the chars count is 71. I need to add a tick symble to the end of the font char set. How do i add on the end another page (i dont think thats the right turm) to the end of my font char set so i can make a new symble in the font I am trying to achive.