On the Wright Eclipse Gemini 2 bus on OMSI 2, I have 2 issues:
1. The lights are not turning on in the bus
2. The destination doesen't show up on the front of bus.
I think some of the interior light switches have 3 positions instead of 2. Try turning them on a few times. The default keys are '6', '7', '8' and '9' on your keyboard, providing it's of a standard British layout. When it comes to the destinations, you are probably missing the dot matrix .bmp file. It was missed out from the original download, but is available separately in a post on the 'OMSI British Buses' Facebook page. Make sure you put the .bmp file in the right place.
my problem with the bus is that the bell dosnt work
It sounds like your download is not complete. By not working, do you mean it doesn't make a sound but still activates the stop request, or the bell just doesn't function full stop. Try redownloading the whole bus, from the base version.