Open the Garmin Connect app.
Access the menu by selecting More (bottom right).
Select Garmin Devices.
Select Forerunner 45 or 45S.
Select Activity Options.
Select Displayed Activities.
Select Edit.
Select
or 
to add or remove displayed activities.Select Done.
Sync your device.
Select your product to confirm this information applies to you
Customizing Activity Profiles on a Forerunner 45/45S
The Forerunner® 45 and Forerunner® 45S watch offers several indoor and outdoor activity profiles, but can only display up to 6 activity profiles at a time. The activity profiles you wish to enable can be customized through your Garmin Connect™ account, however the order in which they are displayed cannot be adjusted. Select one of the options below to view instructions on how to customize which activities are displayed on the device.
NOTE: The Run activity profile is the only activity that cannot be removed.
Sign in to Garmin Connect from a personal computer.
Select
in the upper right corner.Select Forerunner 45 or 45S.
Select Activity Options.
Select the check boxes on activities to be displayed.
Select Save Settings.
Sync your device.