On the dropdown, Select the aspect set that you want to alter the orbs.
Below this you will see all of the aspects currently available in Astro Gold. For each aspect that you want to include, make sure that there is a tick in the box under ON column.
To the right of this column are the four orb settings columns:
App = Applying with Sun or Moon
Sep = Separating with Sun or Moon
App (Oth) = Applying with all other bodies
Sep (Oth) = Separating with all other bodies.
Click in the row for the aspect orb you want to change, and type over the numbers to enter your own orb.
If you want to create a new aspect set with different orbs than one that already exists, you can start with the existing one, like Standard.asp, and when you are done changing all the orbs to meet your needs click the Save As button at the bottom, create a new name for this revised aspect set, and that way you can have two different aspect sets.