There are no right words

Most people who say they cannot pray mean they cannot find the right words. The instructions Jesus gave are shorter than anybody expects, and most of them are about what not to worry about.

Read

Matthew 6:6KJV

Verse 6. But thou, when thou prayest, enter into thy closet, and when thou hast shut thy door, pray to thy Father which is in secret; and thy Father which seeth in secret shall reward thee openly.

Read it in context

If you want to read on

Matthew 7:7

Think about this

What has stopped you praying? Not the respectable reason: the actual one.

Pray

God, I do not know how to do this well. I am starting anyway.

These are words to start from, not words you have to use.

Continue in prayer

If you want to take one more step

Find a room with a door. That is the whole of the setup Jesus described.