Yes you can! On the main screen click the 3 ... in the bottom right and go into Settings. Scroll in settings until you find Log Text. Click into that and whatever you write here will be posted to your log. You can also click the 3 ... in the top right of the Log Text screen, select Insert Keyword and you'll see a list of shortcuts to add.
I'm not a "trackable" guy but I think what you want is ... when you are creating your log, scroll to & click Trackable Drop/Visit. On that screen, click the 3 ... in the top right and select All Visted.