The erecting prism is used for daylight only as there is no up and down in the night sky,you can use the barlow with the right angle adapter and the erecting prism.
the barlow goes in first then the right angle adapter then the eyepiece, the same procedure with the erecting prism.
Dont use highpower eyepieces use only low power such as the above post says, I presume it is a 60mm refractor and has a long barlow
