One More "gotcha" the HAXM isn't installed until you run the exe file.
Follow the link at the bottom of this summary.
There are different AVDs, Those that use x86 and those that don't.
If you have and Intel processor that supports HAXM then you can use the AVDs that use x86 system images.
Click the device you want to use in AVD manager and click the edit icon.
the second line down will confirm if the device is using an x86 system image.
If you don't have and Intel processor, you will need to clone the device and modify it so it has a non x86 system image.
If you do have and Intel processor, then here is my "canned" answer.
1. You need to have an Intel chip set that supports HAXM.
2. You have to turn it on in your BIOS
3. You need to download AND install HAXM in your SDK manager.
I found this link and followed instructions for installing using Studio > Tools > Android> SDK Managerhttps://software.intel.com/en-us/android/articles/installation-instructions-for-intel-hardware-accelerated-execution-manager-windows