Solitaire on BBO allows you to play hands on your own (with robots in the other 3 seats).
To get going, click on Solitaire in the BBO main menu. You will be taken to the Solataire menu.
Here there are two main options:
This takes you to a table where you can play bridge on your own.
Note that at this table the robots will not be using Acol, (I think they use SAYC). To see the meaning of a bid, just click on the bid.
Here I have clicked on opener’s 1D bid.
In Bridge Master you can play (and replay) set hands to test and improve(?) declarer play.
Select a level and a deal and you be taken to it. The bidding is done for you, and after a second or two the lead is made and dummy appears. Then you can play.