Stating the obvious
I need to use your site to create references for online webpages, and it does not have an option to do so. There is no box to insert the url. Your site only allows us to either create references for documents like pdf files we find online and dowload, or those from the school database, most of which already have references listed in the description section.
As noted in the comment, a url can be inserted when choosing the Web Page reference type. In addition you can use the Save to RefWorks plug-in to create a reference from a website.
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Anonymous commented
To add a webpage click on the Add button and choose Create New Reference. Then choose webpage from the drop down list and URL should be a field you can use. if it isn't it's a problem with the referencing style you are using.