Malwarebytes does not generally block access to a webpage without good reason. If a usually "safe" site is blocked, it is usually because some malicious content was detected.
Malware writers commonly insert "poisoned" links into legitimate websites, and it may be such a link that is the reason that Malwarebytes has blocked the particular site you're wanting to visit.
If you're absolutely convinced that this is not the case, it is possible to add the site to an ignore list, so that Malwarebytes does not block it. If you do this, then you yourself are responsible for anything that may happen as a result.
To add a site to the ignore list ....
Visit the site, and when the Malwarebytes block message comes up, right click on it, and from the context menu that appears, select that you want to add it to the Ignore List