Office Web Apps 2013: Documents are not enabled to edit on browser

Hello,

I've enabled Office Web Apps 2013 on SharePoint 2013. However, the document are opening as view only with no panel menu at the top. I've the editing license. Therefore, i ran the following commands on my SharePoint server using SharePoint Management Shell

1. Get-SPUserLicense

2. $a = New-SPUserLicenseMapping -SecurityGroup "Domain Users" –License OfficeWebAppsEdit

3. $a | Add-SPUserLicenseMapping

4. Enable-SPUserLicensing

5. Set-SPWOPIZone -Zone "internal-http"

Still, it is not showing the panel and not editing any document.

Sohaib Khan