Hi Lexi Mace,
Welcome to post in our forum.
Based on your description, I understand you want to edit simple URLs in your SFB server topology builder, you could try the following method:
1.In Topology Builder, right-click the SFB Server node, and then click Edit Properties.

2.In the Simple URLs pane, select either Phone access URLs: (Dial-in) or Meeting URLs: (Meet) to edit, and then click Edit URL.

3.Update the URL to the value you want, and then click OK to save the edited URL.
After you change the simple, please publish the topology again.
For details, you could refer to the following document, it’s same to SFB 2015
https://technet.microsoft.com/en-us/library/gg398063(v=ocs.15).aspx
The following blog is about how to change simple URL for web service, it’s same to SFB 2015https://technet.microsoft.com/en-us/library/gg520992(v=ocs.15).aspx
Hope this reply helpful to you.
Regards,
Alice Wang
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