1. Create client in Arma

2. Connect Storage

Once client is created, choose storage from the storage tab (see below image)

An Important note you cannot change the storage once saved. To change the storage will require you to setup the client again.

Fill in all the fields including description as per image above.
The Secret key will remain hidden and is within your S3 config.

The following fields are required and should look like the image below,

This is the list of Region End Points from Wasbi

https://wasabi-support.zendesk.com/hc/en-us/articles/360015106031-What-are-the-service-URLs-for-Wasabi-s-different-storage-regions-

3. Save and use
Once saved your storage is configured you can then create your backup profiles.
You can edit these storage settings at any stage int he console.