This is my 6th year learning Spanish. I'm not that great, I'm only a senior but maybe I can help you because I'm studying it too. To be honest, it will always be a little hard figuring out what tense goes where when you're not fully a hispanohablante (spanish speaker).
What exactly do you need help with about your tenses? In reality if you aren't constantly around Spanish, the only way to learn your tenses is to constantly conjugate them over and over with different tenses. Lol, it seems tedious but once you do it for a while, it comes to you pretty quickly.
here's an internet sight for all types of grammar topics.
http://www.fcps.edu/DIS/OHSICS/forlang/spanish/stars/index.htm
Once you learn the conjugations, you should start conjugating them in your head while you talk.