how do inert a new sd card into my mobile phone

[AC Question]

ok so I have a Samsung j3 and ive taken out my old sd card and have trie to insert a new one but my phone wont accept my new sd card ...what do I do

 

[Tim1954]

Won't accept? You mean mechanically or electronically?
There is only one way that card can go in!
Anyway, tell us device at least so we can be more specific