Make discovery process more clear

main.py

@@ -62,7 +62,7 @@ class Hui(wx.Frame):
                 self.Bind(wx.EVT_BUTTON,
                           lambda event, mbridge=bridge: self.goto_bridge(mbridge), btn)
         else:
-            btn: wx.Button = wx.Button(self.pnl, label="Discover bridges")
+            btn: wx.Button = wx.Button(self.pnl, label="Press Hue Bridge button, and then press here")
             self.sizer.Add(btn, 0, wx.EXPAND)
             self.Bind(wx.EVT_BUTTON,
                       lambda event: self.discover_new_bridges(), btn)