If you change employers, remember to authorise your new employer to deduct the membership fee from your pay.
You may print the authorisation form in Finnish here. Check the box ”Työnantajan/ työpaikan muutos”, fill in sections from 1 to 5 and from section 18 onwards until your signature. Submit the signed form to the payroll department of your new employer.
The authorisation form is a multi-function form, which you can also use for joining JHL and changing from one local branch to another.