You will need to review the guidance at RDR1, relating to residence, domicile and remittance at:
Residence, domicile and the remittance basis: RDR1
and take the tests, to determine if split year treatment applies to you.
If split year treatment does apply, you are not liable to tax on your foreign earnings, however you still need to show it on your tax return.
You would need to register for self assessment and complete a tax return after 6 April 2023.
You can regiser at :
Register for Self Assessment
You can also download the main tax return (SA100), Employment (SA102) Self employment (SA103) and residence (SA109) amongst the other supplementary pages if appropriate.
The official exchange rates can be found at:
Exchange rates from HMRC in CSV and XML format
You can use any of the methods to convert USD to GBP.