If you're a Hallam student, then you can probably take part. Any 'full member' of Hallam Students' Union can run for a position in the election, and as a student you are a member of the Students' Union. This means that, whether you study full-time or part-time, are a mature student, international student, undergraduate, or postgraduate, you can take part.
International students studying for a Sheffield Hallam degree are eligible to run and vote for any position (not just International Students' Officer!)
There are a few exceptions you should be aware of:
Unfortunately, exchange students are unable to run in the election; Sheffield Hallam needs to be your 'main' university of study. Exchange students can still vote, though.
Some students 'opt out' of Hallam Students' Union membership - if you've done this, then you will have to opt back in to take part.