Review transactions
The Transactions page is the read-only history of everything SimplyLedger has indexed for this entity.

Reading, not posting
This page is deliberately separate from posting. Nothing you do here changes the ledger; it is where you check that what was synced matches what you expect. Turning transactions into ledger entries happens under Posting.
Wallet and exchange activity
On-chain activity is on this page. Exchange activity lives under Exchange Transactions, reachable from the same Transactions area in the sidebar when the entity has an exchange connected.
Filling gaps
If activity you expect is missing, use Request historical transactions. It queues a backfill, which you can follow on the transaction sync page.
Check first that the wallet's chain is right. An address added under the wrong chain indexes nothing, and looks identical to a sync that has not run yet.
Next
With transactions in place, post a transaction to get them into the ledger.