Can I ride a triple front chainring with no front deraileruer
This is generally a YMMV case -- some chainring+cassette+frame+rider combinations do OK with this, others really need a front derailleur/chain guide for this to work.

My suggestion to ride it without the front derailleur is to get the chain as straight as possible (put the bike on a stand, and try different gear combinations until you get the one that looks the straightest) and be smooth with your riding. This will probably be something like the middle chainring in the front and something in the middle in the back.