There are several websites where the login web page is named "Login".
How can I make it so that KeePass can identify (associate) the page with the
There are browser addons for popular browsers that post the domain or URL to the Window Title (browser tab title). The two KeePass options in Tools>Options>Advanced(tab)>Auto-Type(section): 'An entry matches if its URL is contained in the target window title' and 'An entry matches if the host component of its URL is contained in the target window' are intended to work with the browser addons.
Alternatively you can use one of the form filling plugins or the WebAutoType plugin.
You can do this manually by setting a Window Target for the entry you want to use (Edit entry, Auto-Type, Add). If you have multiple entries that match KeePass will show you a list and allow you to select which entry to use.