The dictionary can be found at

Good dictionary: forgiving

un - an

una - a

un - (ooon)

una - (ooo-naa)

a bit of chalk red

a pencil pink

or

A pink pencil

a notebook yello

or

a yellow notebook

a blue pen

a green black board

A purple desk

an orange book

A black writing desk

a brown door

a white table

when do you use un and una?