How to change URL from HTTP to HTTPS

Hi- I am trying to update my CRM2015 URL to a new name and from HTTP to Https.

eg change from http://crm-2015 to https://crm.<companyname>.com 

I have done the following steps but it still does not work. Any ideas what steps I'm missing?

1- IIS Manager- Microsoft Dynamics CRM website-->Bindings--> Edit to add new host name

2- Microsoft Dynamics CRM Properties- properties--> Web Address--> change Binding Type from HTTP to HTTPs

3- edit regedit to change http://crm-2015 to https://crm.<companyname>.com 

4- Restart

Any tips will be greatly appreciated.

Thanks

Kelly