Rules set prices for a whole period at once: a base rate for the year, a high season, a weekend uplift. The calendar is filled from them, and a narrower rule beats a broader one.
Open the product and press Rates and dates. Current prices shows what each ticket costs today.
In the All year rule, type the new price. A blank field keeps the current price for that ticket.
Press Add a season, name it, choose its From and To dates, and type the season's prices.
Press Add a weekend rate. Sat and Sun are chosen; press a day chip to change that. Type the weekend prices.
In Changes to save, press Save the change. Current prices then shows today's new price.
Tip. Rules write the same prices as the calendar, so you can still change a single date there afterwards.