I have a Samsung S5 with android 6.0.1 installed. I have recently updated the OS when the automatic updates appeared on my phone. It used to be easier to transfer apps to the memory card from internal phone memory. Some apps will let you do the following to move them to your memory card.
1. tap the settings 'gear' icon
2. scroll down until you find app manager - tap app manager
3. tap the app you want to move. (I just moved Instagram)
4. tap on storage
5. if the "change" option is available tap it (if "change" is not available, the storage location can't be changed)
6. select the storage location, internal storage or SD card
7. select SD card to move the app out of your phone's internal memory
8. select "move" on the next screen to move the app to your selected location
Not all apps allow you to change the storage location and the option to change the location is not available.