The to-do widget allows you to add a simple to-do list to your start.me page.
1. Click the + sign in the grid
2. Search for "Todo" and select the "Todo widget"
3. Add the widget to your page
Tip: you can right-mouse click on an item to quickly edit or delete it.
If you want to link your Google Tasks to your to-do list, have a look at http://support.start.me/hc/en-us/articles/200162651-Google-Tasks.