and
TiS.
What type of scope do you have?
To increase you magnification use a smaller eyepiece. Magnification is the focal length of your telescope (your documentation should have that) divided by the focal length of your eyepiece. If you look at the side of your eyepiece is will have 20mm or 15mm or 4mm or similar.
eg
FL of scope/FL of EP =1200mm/20mm = 60 times mag
FL of scope/FL of EP = 1200mm/4mm = 300 times mag