Of course not wasted money, unless you don’t use and enjoy it…
Please look at the second post here, your answer on the question how to change the wifi connection for Homey is easily found by searching on the support site of Athom or searching on the forum here.
But maybe next time you should type your question as subject, discourse would have suggested reading that post.
Btw soon this will also be possible from the mobile App
Therefore I will close this discussion …