The Broncos face overwhelming favourites Wigan in Leigh on Saturday knowing that victory against the Warriors would complete one of the competition's greatest upsets.
Fourteen years ago they reached the final, losing 52-16 to Leeds at Wembley, and Australian short-term signing Soward wants the current squad to go one better - even if the odds are heavily stacked against them.
"It's about building your own legacy," he said. "The year 1999 was a great time for the club, very historic and everyone talks about it, but this group of players have to take their chance.
"We can respect 1999, but this is our time and we want people to talk about us in 10 or 20 years time.
"I'm expecting Wigan at their best, that's why they're near the top of the table. They have world class players everywhere.
"This is the most important game that I've played in. It's a one-off and you have to enjoy the week with your team-mates. This is the start of an exciting week."
Soward's sentiments were echoed by coach Tony Rea, who was the Broncos' chief executive in 1999, as he laid out the challenge facing his team.
While Wigan sit second in Super League, the Broncos have been cut three points adrift at the bottom, although they will be able to select on-loan Warriors second row Rhodri Lloyd.
"The preparation has just begun. We've spoken about how we want to approach the week. This type of game feels different straight off its own bat, so you try to normalise that," Rea said.
"It was a great experience in 1999, but it was a long time ago so trying to remember it is pretty hard.
"The fact people are still talking about it says to the players that that's the legacy you'll leave, that's the opportunity you have.
"It would be nice if we're talking about this year as much as that one, but we are a long way from there because we have a very hard game in front of us on Saturday.
"The bookies and form guide have Wigan as favourites. In life you'd like to be the favourites with great form behind you, happy and playing well.
"We deserve to be where we are in Super League because of our actions."
The fitness of Soward, Tony Clubb, Michael Witt, Matt Cook, Dan Sarginson and Michael Robertson will be assessed on Tuesday after Rea revealed all six players are 50-50 to make the match.
"We need some blokes to pass fitness tests tomorrow before we can think about picking our team," he said.
Rea refused to discuss Clubb's contract situation after the England international requested an early release from his contract as he is "sick of losing".
"That's got nothing to do with this week. He's part of the squad for Saturday and has got his head on," Rea said.