I did some research on their website. It seems I have to open a brokage account to buy stocks or ETFs. They do have something called IRA brokage account.  Does this mean I can't use the money in my Roth IRA account to buy stocks or ETFs, and I have to open another so called IRA brokage account to do this? So, the annual total investment in these two accounts cannot exceed $4000, right?

Thanks for the help.