Formatting – a simple issue

Hello out there.

I have the vantage theme. Love it. Yesterday I added a plug in and now one of my rows of formatting have gone.

What I mean is (first row). Bold, Itelics, ABC with a strike through it, Bullet points, quotes, Right, centre and left justified, add links.

Well there was a second row. Where I used the headers (h1,h2,h3), changed colours and other options. This row is gone.

Could you please advise me how to get it back.

I feel a bit of pressure as my post goes out tomorrow and won’t be completed properly.

I do eagerly await someones informative reply and would be ever so grateful.

Thank you in advance.

Rachel.