Imagine the current time we all exist in as a single line on a sheet of paper where every single moment is located on certain distance of the beginning of the line. This line does not get longer or anything, it is with fixed length (one you can not know if you are on that very line) - every moment of existence is on that line and "time" is at what place you are on that line.
Now how do we travel in time? First comes the problem with the "speed" of time. It is rather useless in this explanation, since no matter how fastly we move through the line we would experience the same effects from it and time would seem the same. Lets step aside for a moment. Say we are only looking from aside to this line and time flows normally for us as observers but its not moving on the line. The current "time stamp" remains on position X - time has stopped. If you are on that line you wouldn't experience the time stopping. Nothing would happen and there is no way of recording or observing thi