arcright

Hi I saw a post stating that the hotpoint WDL520P doesn't have a filter, I think I have washed my necklace in my pockets of my Jeans and as I couldn’t find it thought I would look in the filter area, I have removed the front bottom panel that has a red plastic disc with a hand sigh and an arrow, does any know what this means ? I take it I should attempt to open it ? thought that might be where the filter was until I read the post on this site.