How can i integrate the p_start_date and p_end _date parameters into this query in BI Publisher?

Summary:

I need to integrate the p_start_date and p_end _date parameters into this query in BI Publisher

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When i mean p_start_date and p_end _date parameters,

Code Snippet (add any code snippets that support your topic, if applicable):

SELECT
papf.PERSON_NUMBER,
ppnf_ler.full_name AS Learner_Name,
wlif_tl.name AS Course_Name,

COUNT(DISTINCT CASE 

                    WHEN TRUNC(warf.assigned_on_date) BETWEEN TO_DATE('2024-01-01', 'YYYY-MM-DD') 

                                                           AND TO_DATE('2025-04-01', 'YYYY-MM-DD')