Hi @Snuggle27
Welcome to the community!
Your handset will have a pre-set password, but you can change this to something you'll remember.
To find out what the password is go to settings > more > tethering and portable hotspot > portable hotspot settings > configure hotspot > tick the "show password" box
The password displayed here is your password, to change it simply delete the password and type in a new one
Hopefully that helps 
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