You downloaded the wrong app.
There's several apps called Easy Dialer -- that's why I provided a link. You can also search by the author's name, Jarkko Tuovinen.
This program does not have ads, and doesn't ask for unnecessary permissions to run. It only requires your contacts.
Since Microsoft upgraded (downgraded, IMO) their store, the only way to download programs to your phone is to open the store on your phone, find the app and download it directly.
I use the online version of the store to search for apps. When I find one I'm interested in, I go to the store on my phone, type the app name in the search box and download it.
Important note: Make sure you're downloading to your phone the same program you're looking at online. Sometimes there's several programs with the same name. This is what happened to you re. Easy Dialer. Look at the author's name, and make sure it's the same app. The icon isn't always enough, since some apps use the same icons.