  We analyze the formation of Majorana zero-modes at the edge of a
two-dimensional topological superconductor. In particular, we study a
time-reversal-invariant triplet phase that is likely to exist in doped
Bi$_2$Se$_3$. Upon the introduction of an in-plane magnetic field to the
superconductor, a gap is opened in the surface modes, which induces localized
Majorana modes. The position of these modes can be simply manipulated by
changing the orientation of the applied field, yielding novel methods for
braiding these states with possible applications to topological quantum
computation.
