You can not see your trading history from within your ThinkPortal. However you can see trading history from within your Trading platform.
 

For ThinkTrader (Desktop)

Toggle the Bottom panel on. In the bottom right corner you will see your account information, where you can choose between Accounts, and select trades Active, Pending and History. Press the Trading Report button to generate a downloadable report.
 

For ThinkTrader (Mobile)

Select the Positions screen on the bottom panel to see Open trades, Pending Orders and Closed Trades. To generate a downloadable report you can select the More screen and choose the Reports option.
 

For MT4/MT5 (Desktop)

Open your Terminal/Toolbox panel (CTRL-T) or View menu > Terminal. Then select the Account History tab. Right click and filter your view between All History or Custom Period. If you would like a downloadable version, right click again on your Terminal panel and select Save As Report.
 

For MT4/MT5 (Mobile)

Select the History tab on the bottom panel. There you can select between open positions, pending orders and closed deals. You can not download a report from Metatrader mobile.