Fiver mobile


I am new to fiver and am using my phone to try to create my first gig. It asks you to put at least three tags and seperate them with commas. I do this (eg. Tag, tag, tag) and it will not accept this. It keeps kicking me back saying I need at least 3 tags to post. I have tried two different browsers (ie and chrome) but still not working I have even tried putting them in different ways, what do I do?