Crown rot? Top leaves get yellow. Please help.

[HM85]

Hi everyone.
I got an orchid as gift less then 2 months ago.
Since I got it there’s only problems with it.
I’m not an expert in orchids but I try my best to learn and take care of what I have.
Few days after I got it I nothiced a leave in the pot in the bark, I grabbed it and it went out easy without making any effort. Few days after about 2-3 leaves from the bottom died and fell and lots of flower died too and some survived.
Then I started to notice problems on the top. The leave in the top turned yellow from the crown area slowly and I saw a stain of dry liquid that went to the crown (I don’t think it is water stain because of the weird color, but I can’t be sure). The leave died and again I just touched it and it fell. Now there was a new leave with same problem I took it off yesterday because I realized it infect the orchid. But the crown is yellow and I see the next leave in order is getting lighter and yellow. I don’t know what to do. I can’t easily get materials I see people use to help their orchids.
I only get the bark wet never water from the top. No direct sunlight. I lost count but I think it lost between 6-8 leaves, now it have only 4. The leave in the picture is one I took out yesterday.
And I have a picture from the day I got it.
I would appreciate any help.
And I’m sorry if my English isn’t the best, tried my best.

Thank you,
Hila.