Welcome Liz, @lizpratt0908
Do read thru the FAQ and LEARN pages to give you "all" you need to know about 5:2 and intermittent fasting, There is also a useful summary from ferretgal - look thru other recent introductions to find the link.
The usual 5:2 fast day is to have up to 500 calories (theoretically about a quarter of your usual day's consumption). Most people find it easiest to save those calories until dinner time, and just drink lots of non-sweetened drinks during the day. Keeping busy helps a lot too. But if you really feel too hungry during the day, a miso soup or similar, or a hard boiled egg, can help. Avoid eating processed or starchy or sugary carbs - have lots of (non-starchy) vegetables and good quality protein for your dinner. There are lots of recipe ideas if you don't have a meal in mind.
Good luck and best wishes