leaves turning brown/yellow round the edges

[loo-c]

Firstly im new to all this!
My boyfriends brought me two 'little lady' phalaenopsis from our local supermarket. I did a little bit of research when I got them and found that the pots they were in were no good due to them not havin holes in the bottom! So...I got the appropriate pots and re-potted by following a video online. The roots didnt look to bad when I took them out. All the bloom had fallen off by then time id re-potted...a couple of days after I got them...so again from reading up on the internet I cut the spike down.
They seemed ok for the first week but both of them are starting to go brown around the edges and im not sure why
Im not sure if what ive read and done has helped but I really dont want them to die
I would put up some pictures but im not sure how, so any help would be really grateful!!!
Lucy