Can I trade Micros?

Yes. Micros are active and included with all Accounts.  You are allowed to trade up to 10x the number of Micro future contracts as your standard lot max contract limit on your account.  I.e.  If you are in a 3 max contract account... you can trade up to 30 Micros.  If you have an 8 contract max account... you can trade up to 80 Micros. 

Warning: Do NOT engage in any trading activity with money you cannot afford to lose. Day trading can be extremely risky and offers no guarantee for success. You should not fund day-trading activities with retirement savings, student loans, second mortgages, emergency funds, funds set aside for purposes such as education or home ownership, or funds required to meet your living expenses. 

If you engage in day trading activities, set a budget and do not spend beyond your set budget.