While you can search abstracts for free, getting full text articles usually requires that you authenticate as part of UCSF. The easiest way to do that is to begin at this UCSF version of PubMed
and enter your MyAccess credentials, if prompted. Next, change your results view to "Abstract" and the UC-eLinks buttons will be revealed with individual articles. Clicking the UC-eLinks button should lead you to full text, if the library subscribes to that journal.