How to sell Canadian TSX listed shares

My mum is Australian (and lives in Australia). She had shares in a company years ago that were bought out by another company, then another, and eventually bought out by a Canadian company. She's not sure how to sell them. I've asked her to dig out as much info as she can find and this is what she's provided me with:

1) It's in a company called Mega Uranium (MGA).

2) It appears to be held by a company called "TSX Trust".

They aren't worth very much, I think $700 worth of shares, so she's after the cheapest possible way to offload them. Can anyone please advise on the best way to approach this? She had a hunt around on Google and found this: Trade Canadian Shares | POEMS Australia

But we're not exactly sure what the best way forward is.

 

maybe try interactive brokers?