Now you are in the dashboard of Albedo, which is very clear and intuitive, to add liquidity select "Liquidity" (fig. 16) click on "Deposit liquidity to the pool" (fig. 17)
(fig. 16)
(fig. 17)
Select XLM and Stellar CANNACOIN as a pair, enter the amount you wish to place in the pool (50-50) and finally click on deposit (fig. 18)