You don’t have to know what species you took a photo of – you just need to take a good enough photo (or photos) that it can be identified. For fungi this means pictures of the cap or top of the mushroom, the gills/pores/teeth or underside of the mushroom and the stem. In fact the species you don’t know are going to be more interesting than the common species that we all know! There are a number of resources available to help you get started with iNaturalist and ideas for exploring your local environment:
For Morels I recommend obscuring the location when posting the picture to iNaturalist so that you are not sharing your prime spot with all and sundry.
If you are good at identifying species from pictures please look through the iNaturalist observations for the weekend. Even if you don’t know exactly what it is moving it a bit closer in the right direction can help.
Good luck finding interesting species!