If you haven't selected the race yet:
1. On marathon race card stack swipe through all of the offered races and at the bottom of the card stack you'll see a screen saying "We’ve run out of races to show you…". Tap on a Enter manual race button.
2. Enter your marathon's name, date and country. Tap Select this race.
If you already selected another race, you can change it. To do so:
1. In Hiiro iOS app go to Profile & Settings → My race.
2. Scroll to the bottom and tap Reset race.
3. Your race will reset and you will be presented with card stack of other races to choose from.
4. Swipe through all of the offered races and at the bottom of the card stack you'll see a screen saying "We’ve run out of races to show you…". Tap on a Enter manual race button.
5. Enter your marathon's name, date and country. Tap Select this race.
Keep in mind that resetting a race will rebuild your plan.