Yes, you absolutely can.
buyMyplace has no issues with this, as we are not acting as your agent. We are only responsible for your advertising, so you are completely free to engage in an agents services simultaneously if . you wish.
However, please make sure your agent is comfortable with you advertising with us at the same time. This agreement is between you and them, so you need to keep them in the loop.
It is important to discuss what will happen if you receive a buyer through buyMyplace. You and your agent should have an understanding about whether there will be any commission if you sell through buyMyplace, and not through them, or vise versa.
It is best to have this conversation and clear this up at the start, to save tricky situations arising down the track when you have a buyer for the property.