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Try updating the Android version on it, if not to increase the version, at any rate to apply all released versions to the version that is already on it.
Also check for the StageFright exploit weakness in your Android version - probably unrelated, but essential to prolonged good operation of an Android device:
Does the keyboard slide away? if so, try scrolling it or swiping it into view again. And try tapping on the text entry field, so the cursor is in the text entry field... that may bring the keyboard back.
I apologize for being too detailed. I was not aware of your need for basic terminology and instructions, or I would have rendered my attempt at an answer otherwise.
I am glad to hear that the issue has been resolved. Thank you for letting us know, and your asking your question here at JustAnswer is appreciated.