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Sign In vs. Sign Up
Sign In and Sign Up are two different functions, with different buttons & pages, and they should remain separate.
However, there should be consistency in how they reference each other, as well as improved visibility. Specifically:
Sign In has small text links at the bottom for Sign In and Sign Up. The Sign In link is redundant since the user is already on that page, and should be removed. The Sign Up link is OK but there should also be a prominent Sign Up button. I know there is a button visible in the header, but that may not be so obvious to a newbie. I suggest something in the top, together with "Your sign-in information is the same on all Codidact sites", like:
New user? Click [Sign Up] to join Codidact. It is free and easy and lets you vote, ask and answer questions and participate in many other ways.
Actual text to be an instance/community-specific string.
Sign Up has a small text link at the bottom for Sign In. While an already registered user at least has some experience with the site, based on the numerous newbie-double-accounts in Some Other sites, I suggest adding something like:
Already registered? Click [Sign In] to sign in with your existing details. Please don't register multiple accounts unnecessarily - it makes it harder for you to keep track of your posts and gain privileges on the site and it makes it harder for the moderation team to manage the site. If you forgot your password, click [Forgot your password?].
Actual text to be an instance/community-specific string. This replaces the existing text.
Key to both is that the links/buttons should be really obvious. Either inline buttons or somehow big/bold/underline/boxed/fontawesome icon/etc. A blue (not even underlined) link in the same size just doesn't stand out. For the geeks among us, none of this is a big deal. For the non-geeks, it gets confusing/hard to use.