from pooltool.io telegram channel (@pooltool):
Logins have been enabled again on PoolTool. You may login and claim your delegators addresses and/or pool addresses. If you are a Pool Operator then you will need to claim your rewards address for your pool to have access to the management tools. If you are a delegator, claiming your address now will allow you to have access to some features we have coming up soon.
The easiest way to claim your address is to find it in the delegators or pool section and click the claim button which will look something like this once you find your address details page:
At this time we allow you to update your pool message. Telegram communications are coming back soon.
Please keep in mind that this is a totally new login system. Everyone needs to re-create their account to claim their addresses and pools. The old email based system will not work. You are now logging in with just a cardano address and a password.