In the iOS app on my iPad the support page has a search but the keyboard does not appear when you click in it. This makes it difficult to search!
if I select to open safari browser, I can search.
Could you make sure that you've got the latest version of the app installed and restarted your phone?
If the issue persists, please contact our support so that this can be investigated: https://support-request.tado.com/#/contact?locale=en