In Google Search Console I see many urls with the warning "Indexed, though blocked by robots.txt". Most of them are like this (with the register?to=) :
Ideally I would like to have the NOINDEX or at least the CANONICAL tag on those pages. Unfortunatelly they have neither.
Is there a way to add any of these tags on those REGISTER pages? Maybe through a plugin, or by making a change in the code?
In the robots.txt I have this rule:
This prevents crawling of the pages, but cannot prevent their indexing.