Maybe it is the classic. Im not sure. This is what i saw C:\Program Files\MultiBit-0.5.17
And i also saw a multibithd folder then i tried to click the .exe and the icon shows different from my wallet. It has HD inside the B of bitcoin while mine doesnt hav. So maybe it is classic what i have. So you mean i wont lose the bitcoin but i wont have it until i revert it. I hope i wont lose my bitcoin if i made a mistake reverting. I am hoping for your guide. thanks
You are probably using Multibit Classic as it seems that Multibit HD has not yet gotten to 0.5.x releases yet. However it seems that Multibit classic does not support setting the transaction fee, so you won't be able to resend the transaction with a higher fee unless you migrate to a different wallet software.