Step 4: Add the Yeast and Knead
By now the yeast should be activated. There should be foam or bubbles at the top of the yeast mixture. Add this to the flour and mix. Add extra flour if necessary (see pictures below for examples of dough that is too wet). Knead (push down the dough, turn it and push down again) the dough for about five minutes. Let the dough sit for 10 minutes.