Your activity should register in your IFTTT app under the home feed. Then in Qapital, if you go to the Goal the IFTTT recipe is working toward and click that, the activity and amount should be listed in that specific feed. It will list as "You saved with IFTTT," the time and the amount saved.
This means it will not show up in your Rules within Qapital. It will only show up in your Goal feed, and it will only appear once your Rule has triggered savings within IFTTT. IFTTT recipes cannot be seen in your Qapital account. To edit these, you need to login and update through your IFTTT account.