OK so now you should pot up each seedling individually. Grow them on a bit before planting them in the garden. Disposable drinking cups from the supermarket might be more economical. Poke a drainage hole at the bottom of each cup and pot up each seedling in its own cup. Then prepare a planting bed somewhere in your garden. After a couple weeks, plant each seedling in the garden.

Many thanks

You are welcome. They are very delicate. A tea spoon is very handy for lifting them out and placing them into individual pots. Then give them each a drink to settle them in.

once you have potted them up leave the lid off except at night and ensure they have plenty of light.
I use either a pencil or kids short knitting needle to lift them out.

I would give them all the light you can and leave them until they have another pair of leaves.
I use the other end of a teaspoon or a plant label to lift them out of the seed tray. I wonder what other people use?

If they are too tall to put the propagator lid over them you can always use a sheet of plastic, a plastic bag, some fleece etc - just something to keep in a bit of warmth and humidity overnight.