Putting your tyre back on.
To mount your tyre, first, fit the bead (= the flexible or rigid part, depending on the model, that determines the shape of your tyre) to the rim.
Once you have done this, inflate your inner tube by approximately 30% before fitting it to the rim (inflating it beforehand reduces the risk of pinching the inner tube).
Next, fit the second bead to the rim, starting at the opposite side to the valve.
All you have to do now is inflate your tyre.