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Hi @N2R, welcome to the community.
You can not 'unforget' a bluetooth connection. You will need to re-pair with the device.
@Smileysal what device are you try to pair? Many bluetooth devices need to enter in pair mode, if you are already in pair mode and your phone isn't able to discover it, can you try with another phone? If another phone cannot even see it.. then your bluetooth accessory is not working properly