Hi @Hezza,
A warm welcome to the Bunnings Workshop community and thank you for your question.
Without knowing further details, this discussion may be helpful - How to feed new line into Ryobi OLT1833BL line trimmer?
If this does not answer your question, I'm going to need some further information to assist.
What model line trimmer do you have? What thickness of line are you using? What specific difficulty are you having?
Do you have some photos you can upload? Let me know if you need assistance uploading images. I'm happy to help if required.
Any further information you can provide would be helpful.
Jacob
