There are two ways that this can be done.
If you are looking for a transaction within the last 90 days, you can go from the main page of online banking and press on the name of the account you wish to pull the transaction/s from. Once in, you can search by date and/or keyword in order to find what you are needing.
If you are wishing to have the ability to go back to each month's statement for review, please see the e-Statements section of this knowledgebase for information on how to sign up for, save and print your e-Statements. You will be able to review these up to 24 months starting with the statement after you sign up.