How can I add an album instead of just single songs at a time if i want to

[#1]

How can I add the whole album at a time instead of clicking on each song I'm going back-and-forth to the artist

[Taylith]

Hello there, thanks for reaching out.

I assume you're talking about adding an album to a playlist right?

In that case you go to the playlist. 

Click on the 3 small dots you see  inside the playlist. 

From the list that pops up, click on "Add to playlist" and then choose the playlist you want to add to.
Hope that's helpful, take care.