Meta-analysis is a type of statistical synthesis. A narrative synthesis combines the findings of multiple studies using written description only. All systematic reviews, including those that include meta-analysis, will contain an element of narrative synthesis by providing a written summary of the evidence found.

For help with this see:

Cochrane Handbook Chapter 10 Analysing data and undertaking meta-analyses

Systematic Reviews: CRDs Guidance Section 1.3.5.1 Narrative Reviews

JBI Manual for Evidence Synthesis Section 5 Systematic reviews of textual evidence: narrative, expert opinion or policy 

For further clarification check with your supervisor or tutor.