I forgot to feed it for two days. Should I toss it and start again? Can I just start feeding it? How long does it take to have some yeast?
It's 'ok', Jamila ... you will just have to pick up refreshing the starter by at least 2x or better 3x the weight you choose to use as a base (e.g. 2oz refresh with 2 oz or better 4oz of the same hydration). Do this at least for two or three days until you see the starter double its volume in about 8 hours.
Two days at room temperature is not that much of a problem. You want to keep up a regular schedule to have a more predictable, vigilant starter. One can keep the starter 'neglected' in the fridge for months and get it back in working condition in a matter of days.
Brotkunst is right. Two days is no big deal. I would pour off a portion of the starter and give it ann equal feeding. This will give it a nice boost.
It wasn't an old one, in fact just 3 days. It never did look like it had yeast in it anyway. I hope I can get it to make me some nice bread!