This is the most common attack approach, sometimes it's not even done by anyone that's even remotely skilled. Instead, they think they can get lucky. Look, as long as your email, and password is unique, and is a strong password, then your likely safe. Of course, if you want to go through the additional steps of changing your password, you can do, but that would quickly become tedious if you had this sort of attempt often. If you have an account on any internet based website, that can be perceived as valuable, your going to get these requests, and depending on the perceived value of it, you could be getting up to a hundred a day.
Changing the password is all you can really do, and that's not necessarily required. It's very likely a speculative person looking to gain access, but without any real chance of doing it. There's also another approach, which I can't remember how this forum does it, but some websites require you to know the email that's on record, so when someone goes to the reset password form, they can't just put in the username, and then that automatically pings an email to that user, instead they must know the email. This does add a little bit more security to it, and if that's the case with this forum, which I suspect it's I would potentially consider changing your email address to a unique one just for this forum. Could be an added extra layer of security, if you don't use that email address anywhere else, and it isn't public.
I wonder, however, was the message that you got really from the forum? The sent address should be :
[email protected] and it should just contain the link that would allow you to change the password
Do note that it's rather trivial to spoof an email address, and you shouldn't be relying on that completely. Do your checks, but also if you aren't expecting an email at that time, then you should be suspicious of it from the get go.
In fact you can get rid of risk from phishing email by using a thrown-away email. No one can send you phishing email and compromise your account if you do this.
Throwaway emails shouldn't be confused with the ones which you enter a email address, without a password, since that can bring up security concerns in its own right. Personally, I think the best approach when signing up for a website is to use a unique email address, with a strong password, which you don't access unless you someday want to reset the password. That way, it reduces the risk of phishing since you aren't viewing that email regularly. Then, having a strong password makes sure that it's somewhat secure, and because you've only used this unique email, and password on one site it can't be leaked from another source if they were ever compromised.