Ok, the addons are a bit confusing! But here's the way it works. If you have qASIC shares already, you can get the DUALMOD M10... which is available.
If you buy that, it will convert 630 shares into Active Mining Shares (these show up as reserved shares in your account).
So you'll have 630 shares to mine either VTC or BTC and will have 970 share (97 MHs) remaining on LTC or FTC.
So you really then just need to decide if you want to get paid in BTC for everything or keep the all the coins. If you want to get paid in BTC, you select that from the Coin Choice dropdown and fill in the address. This method only allows you to mine VTC, but you get a 5% bonus payout.
If you want to keep the coins, select either Scrypt-N (for VTC) or X11 (DRK) and fill in the appropriate addresses.
I think if you're new, you also want that LTC address filled out. You can leave that be... (for me, i'm getting BTC payouts and left both LTC & VTC addresses in my account info)... as long as you choose BTC and have a BTC address, it doesn't matter...
As far as profitability goes... VTC is still more profitable than DRK by a large margin... but you can always check it here:
www.ltcgearcalc.com