Search on IMSLP

[MSQE43058402IF]

I know when you search any score, composer or category in general the site, by default, redirects you in a Google search that is like this: https://www.google.com/search?q=site:im ... cz%20Op.16

However, someday I discovered that you can search directly from the site without using the Google search but I can't remember how I can do that;, if anyone knows tell me, please, how to do that. Also, as important fact, I didn't discovered that feature in the Clara version but in the Wiki version. Thanks!