How do I remove the old one?

Please see the attached, I have added the repair manual which explains it in there: Attachment(s): DVS_STIHL_ZBA_ZRA_RA_009_2015_01_01_ZRA_02_02.pdf https://lsengineers.zendesk.com/attachments/token/J1n1sWbO7VcwKmDM96fTFQcU3/?name=DVS_STIHL_ZBA_ZRA_RA_009_2015_01_01_ZRA_02_02.pdf