I had no idea there wasn't a way to change compiler path for the old editor! The default location of DBP is C:\Program Files (x86)\The Game Creators\Dark Basic Professional Online. Ensure it is copied to that location/create any folders needed and it should work. If you happen to get "failed to load .dba" error on 1st compile you might need to change the security settings, so after closing the editor 1) give it admin rights via right click>properties>compatibility 2) in same properties window go to security tab, select "user" and then click edit, then simply ensure you tick the top box in the section below, then apply, close properties window, relaunch editor and you should be good to go.
I wouldn't worry about asking lots of questions, it is what this place is for. So long as folks use the search feature first(top right of each main board) and check obvious places like the stickies at tops of relevant boards then nobody here is going to be bothered. Just getting started in DBP has been known to be something of a significant annoyance to us all. Over time versions/options changed, so when I started it was mostly straight forward by comparison. If I was a newcomer today I would likely be asking similar questions, maybe more lol!
Win 7 Pro 64 bit SP1, AMD A4-5300 APU 3.4GHz, 8GB DDR3, NVidia GeForce GTX 750 1GB GDDR5, ASUS A55BM-E