Once you run a search and have retrieved article citations a button like this one will be visible on most MU Libraries databases. Click this button and you search the MU Libraries holdings for the full text of the article. If it is available full-text, you will be linked to that article. If it is not available online, a link to Merlin, the library catalog, will be given so you can locate a paper copy of the article.
The Journal Locator button to the left puts you into that linker. When you have a bibliography listing specific articles and the journals in which they appear, use the linker to see if they are available online.
JSTOR is a vast archive of full-text articles. Because you search the full-text of an article, it is good to use as narrow a search as possible. A handy trick is to use the advanced search feature at the top of the page and limit the search to words in the title (the right column pulldown). This will make your search much more focused.