After letting the mortar dry for at least 24 hours, it’s time to grout.
Mix your grout as recommended on the package. Make sure you let your grout rest or “slake” before using, approximatly 10 minutes.
Using a rubber float, push the grout into the seams. Work in small sections, pushing the grout into the seams at a 45 degree angle. Using the long edge of thee float, remove any excess grout before moving to the next section.
After 30-45 minutes of curing, use a slightly damp sponge to wipe the excess grout off the tile. In doing so, make sure to not add any extra moisture into the grout. Therefore, sure you’re rinsing your sponge often and really wring out.