By Helen Kelly & Joseph Wilkes Meghan Markle’s “megawatt” smile on her trip to Nigeria with Prince Harry has seen the actress send her fans a clear message, according to an expert. The Duke and Duchess of Sussex have been stirring up quite the buzz with their dynamic “unofficial” Royal tour. Upon landing, they made a beeline for the Lights Academy in Abuja, captivating the audience with an impassioned speech. Their presence at a volleyball match also sparked joy, especially among the children who couldn’t get enough of the couple. Body language expert Adrianne Carter analysed the duo for OK!, …