Hi Katie thanks for posting in the community! Yes you can create a hyperlink in your Lucidchart document and attach it either to specific text or to a shape as a whole! To do so either select the shape or highlight the text you want to hyperlink then choose the lightning bolt button to open the Actions menu. 

From the first Web or Email tab you can simply enter the URL to the webpage where you want to direct users then click Apply. Then the shape or text will remain hyperlinked in your document (and will also function that way in presentation mode or when exported to PDF). For additional details and information please take a look at this Add Actions to Your Diagram article from the Lucidchart Help Center and post any questions below. Hope this helps!