You can choose your LPFSA election amount up to the IRS's or your plan's limit.
The IRS contribution limit changes every year. In 2021 it was $2,750, and in 2022 it's $2,850.
Your employer's plan may have an annual limit that is less, so it is best to check your plan to determine your annual limit.
Please reach out to Benepass Support for any additional assistance.