I'm not a great gardening expert but in the absence of any other advice, I'd try sticking parcel tape on the base where it is coming away to try to hold it together. However, you should remove this in a few months if the plant survives to allow it to grow properly.
I would also put a stake in to hold it firm, and pack soil higher as roots might well come out of the base of the palm and anchor it into the soil.
Hope it survives, mine did when I tried it on a different kind of plant.
Roberta Goodall
March 2008