Creating a new/custom activity profile on the Garmin Forerunner 920XT

• Unlock the screen by pressing Menu (the one with the 3 dots) and then Enter (the one with the arrow)
• press Menu to go to the menu
• Activity Settings: press 4x Down
• Settings: press Enter
• Actitivity Profiles: press Enter
• Add New: press Enter
• Choose Sport: press Up, it shows Other, press Enter
• Choose Profile Color: choose a color and press Enter
• Choose Profile Icon: choose an icon and press Enter
• Choose Profile Name: press Down, Custom is selected, press Enter
• enter a name by pressing Up, Down and Enter for each character and in the end press the Ok mark (one above 'A')
• Choose Activity Settings: Use Default, press Enter
• GPS: On, press Enter
• Profile Added: Done, press Enter

Customizing Datafields

• select your new profile and press Menu once
• Menu: Activity Settings, press Enter
• Activity Settings: Data Screens, press Enter
• Data Screens: Screen 1, press Enter
• Screen 1: Layout (3-Fields), press Enter
• press Up, Up to change it to a 1-field layout, press Enter
• press Down (Field 1), press Enter
• Data Fields: Connect IQ, press Enter
• choose "Wind/Kite Surfing Datafield", press Enter
• press Back and Down to go to Screen 2, press Enter

Customize your other screens as you wish in the same manner as above. I personally use:

• Screen 1: 1-field: Wind/Kite Surfing Datafield
• Screen 2: 4-fields: Time Of Day, Distance, Max. Speed, Avg. Speed
• Screen 3: 4-field: Heart Rate, HR Zone, Avg. HR, Calories
• Screen 4: 1-field: Lap Time (this works as a race timer, whenever I hit the LAP button it starts counting minutes/seconds from 0:00 upwards. So I know that at 4:00 I should pass the line.