How do I open up the cards that I have already created?

[kharveyaycc]

I typed up cards on one of my boards and they seem to be hidden and I don't know how to get them back.

[Iain Dooley]

@kharveyaycc sounds like you've enabled a filter:

https://help.trello.com/article/787-filtering-search-cards-on-a-board

[Viktoria Tamm]

Hi!

Check if you accidentally archived the cards.

For that click on the Show menu button on the right and a menu bar will open.

Under Stickers there is option More and from there choose Archived Items.