User and groups permission in 17.10 and 18.04 using GUI

Where do we add user to groups, change user permission in UB 17.10 or 18.04 ?

I can’t find it in the GUI
tks !
JF
I need to do this " Your user account in Ubuntu guest OS needs to be in the vboxsf group. "

I installed Gnome Users and Groups and am now ok
JF

you can use the command line

sudo addgroup youraccountname vboxsf

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tks @fossfreedom I know but appreciate your answer
I installed Gnome Users and Group to do it though the GUI
JF

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