Lightroom Mobile Android app cancelation

[#1]

I signed up for the premium service of this app and when I should using the app it didn't have what I wanted I wanted to cancel. When I went into the app to see how to cancel it sent me to Adobe. I followed those instructions,  but then was told I needed to log into Samsung account. I logged into Samsung account and I didn't see the subscription listed. I need help. I don't want to get charged for an app I won't use. 

[#2]

I signed up for the premium service of this app and when I should using the app it didn't have what I wanted I wanted to cancel. When I went into the app to see how to cancel it sent me to Adobe. I followed those instructions,  but then was told I needed to log into Samsung account. I logged into Samsung account and I didn't see the subscription listed. I need help. I don't want to get charged for an app I won't use.