Newton's third law doesn't imply that things can't move but it does imply conservation of momentum and energy.
Imagine a scenario where an astronaut is in orbit so they don't feel the affects of gravity. If there is an object floating and they push on it (apply a force to it) we know intuitively that the object will start to accelerate in the direction of the force.
Newton's third law tells us that the astronaut will also start moving in the opposite direction of the force they are applying.
In turn, as the object and astronaut move they push air molecules which push more and so on. If you follow this reasoning through you'll see that ultimately applying a force conserves the total momentum and energy of a system but does not prevent movement of objects within the system.