Navigate to your pc's Documents folder and find the folder there also named Runes of Magic. (the Runes of Magic folder is a hidden folder, if you can not see it then follow the directions below to make it visible)
Directions For Showing Hidden PC Files
1. while in your documents folder press ALT + t
2. click folder options at the bottom of the list that opened in step 1
3. you will see a page with 3 tabs... click the tab "View"
4. in that list find a subsection labeled "Hidden Files and Folders" and select "Show Hidden Files, Folders, and Drives"
5. press APPLY then OK
-- you should now see your Runes Of Magic folder inside the Documents Folder
Open that folder and you will notice a list of folders for each character you have logged in on your pc, inside each folder there is a file name Macro.bsd. Those are the macros for that character. You can also share the same macro file on all characters by copy/pasting the file into each folder, however it will overwrite the existing Macro.bsd file in the character folder. Its useful though if you have alot of custom macros worth using on another toon.
also if you want to transfer all of your saved settings to the other pc you can simply copy/paste that entire Runes of Magic folder you made visible to the same location on the other pc