Help a noob

@VikeMan Thank you for your answer! I think that there is a ring of crude, here is the pic I took yesterday.

 

I'm having a hard time uploading the picture of the wort, anyway, there sims to be a ring of crude above the wort, and there is a little foam. As I mentioned the wort smells pleasently yeasty.

 

Thank you @VikeMan! Why does it smell a bit yeasty? Can it be the result of pitching too much yeast?

 

I got some updates. By the crude ring above wort (VikeMan said that it can be the remnant of krausen) I guessed that the fermentation is over, so I decided that I'll dry hop the beer today. I sanitized an improvised hop bag, opened up my bag of 1.8 oz of cascade pellets, and went to fermenter to open the lid. And what I saw was a serious amount of foam!
So what I did next is probably stupid.I took my hop bag and put it in the wort since I have no equipment to properly repack the hops. As I've seen a fair amount of hop bomb videos, I left the lid on, but not sealed. In how much of a trouble I am?
What should I do, should I leave the lid of the fermenter not sealed, and for what time? I've read on other forums that some people don't seal the lid at all.

 

@VikeMan Thanks a lot! I will do it immediately.
I improvised a hop bag out of sterile gauze, but since I was afraid there might be residue of whatever chemical it was sterilized with, I boiled it over, washed under water, and than boiled it again.