Adding activities from Maps into Tripsy is very easy to do. You can do it from your iPad or iPhone, using latest version of the app.
Once you're in Maps, with the location you want to add to Tripsy, you will tap the "Share" button.
You will find Tripsy on the list of apps. If Tripsy is not present, you go until the end of the list, tap "More" and select Tripsy on the list. Make sure to drag the icon to one of the first positions, to be easier to find the app next time.
You're almost there. Just tap the Tripsy icon and you can select the category of the activity. Most of the information (if not all) will be already filled and you will only need to set the time that you want that activity to be positioned.
Tripsy by default will select your next trip, but you can change it by tapping on the "Trip" item, first on the list.