PubMed is available for everyone to use and with the growing archive of articles in PubMed Central, more and more articles are available for free. However, not everything is available for free especially the most recent articles. If you are affiliated with a library, most likely there is a special way to access their licensed journals. With AZHIN, there is a special link to PubMed that will display buttons for full text.
For articles that you do not have full text access to, you should contact your institution's library, the education office, or purchase them yourself via LoansomeDoc.
PubMed has various tools to help you find and store the information you need. Below are some of the options: