How to replace old micro sd card in Samsung Galaxy S4 with a new micro sd card?

A

AC Question

Am utterly non-technical, need everything in step-by-step ordinary-language instructions please. Must I save contents of my old card to my laptop first? (If so, how?) Do I need buy a card reader? (What is a card reader?) Does either card need "formatting"? (what the hell is formatting?) I bought the new replacement micro sd card but the pack also includes an "sd adapter" (what is an sd adapter? and what does it adapt to what?) I can't be the only person who can't cope with all this stuff: does anybody at all write simple readable english guides to coping with this technical stuff.
I tried reading several of the relevant forum threads, but quickly got lost in a sea of technical talk.
 

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