I have hit the wrong keys it seems and my text is now coming out orange and underlined. What have I done and how do I undo it?

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This is not an answer to the initial problem. It is better to ask a new question with a link to this one (and of course delete this "non-answer").

Be descriptive enough to help diagnose the problem. Mention your OS and LO version.

@Sophronia_13, You need to manage the previous changes: Accept or Reject.

Please, repost your no-answer as a comment. To do that, hover on "more" (just below your text), and press "repost as comment under question". Thanks.