The process of buying $TTT in Terminal Boost is no different than buying cells, only the address to which you need to send the EOS changes.
You can also transfer $TTT tokens to Terminal Boost directly in the Telegram bot. To do this, log in to TTT Balance and click buy TTTS. The tokens will be transferred to Terminal Boost. You can see the current amount of your personal Terminal Boost in the Profile section of your Telegram bot.