After you analyse a strategy in the strategy builder, you can save this strategy to check how it performs before placing real trades. To do this, after analysing a strategy, you can click the 'Save Strategy' button in the bottom left corner, as indicated in the screenshot below.

Once you click the button, you will be prompted to add a name of your choice. Once you have done so, you can click the Save button.

After you have saved your strategy, you can view it in the ‘Saved Strategies’ section in Strategy Builder. 

You can set alerts for your saved strategies or execute them when you see fit.

You can also edit the buy or sell price to check a strategy's potential gains or losses for different entry points.