To change the location of your Render Library use the Render Library pane's option menu (lined button in the top corner, or right-click the tab) to open the Render Directory Manager which lets you add or remove folders. You can also use the button in the Render window itself to switch from using a library to using folders and just ignore the Render Library feature. Similarly, the Content Directory Manager accessible through the Content Library pane's option menu will let you add and remove content directories. You can move the location of the temp folder in Edit>Preferences (Windows, on Macs Preferences is in the DAZ Studio menu).