1st question: click on the stock market->browse it->there are 3 of them who refer the word "bank"->open each of those in a new tab->profit!
2nd question: go to the bottom of that page, you'll find 2 spots where you can buy shares, one of them asks "how many shares do you want to buy", the other one "how much money do you want to invest". On the first one, type 1500000(in this case, this value changes depending on which stock you want to buy the benefit block, it is mentioned in that same page how many you need), then type Ok and it'll say "are you sure you want to buy 1,500,000 stocks of TCB at $X each? This will cost you $Y!"
It is faster than waiting for someone to answer you in the forum.