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Hello and thank you for your question. I look forward to assisting you today. What you will need to do first is purchase a digital license for pro. Check this LINK or check around and you may be able to find one a little less expensive.
If you don't have a product key or a digital license, you can buy Windows 10 Pro from the Windows Store. Select the Start button, select Settings ,Update & security, Activation, and then select Go to Store.
To upgrade from Windows 10 Home if you have a Windows 10 product key:
Select the Start button, then select Settings, Update & security, Activation. Select Change product key, and then enter the 25-character Windows 10 Pro product key. Select Next to start the upgrade to Windows 10 Pro.
Please let me know if need further assistance.