How do I delete all text messages on the LG C555?

when I touch (txt) messaging icon it tells me it is not available at this time. Next time it tells me my messages are full. I cannot seem to get to them to delete.\
Please let me know.
Thank you

Hi Carol. Using the native messaging app, tap and hold 1 message for a second until it gets selected. Once you see this, you can just tap on other messaging threads to select them. Tap on the delete icon to delete selected threads.

To delete all messaging threads at once, tap on Menu and choose Delete all threads.

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