अन्वयः

तम् एनं देवम् that god, विधिवत् as enjoined by tradition, प्रणम्य bowing with profound reverence, अव्ययम् immutable (Brahma), अनामयं च welfare, पृष्ट्वा having enquired, पाद्यार्घ्यासनवन्दनै: fell at his feet with respectable offerings of reception, a befitting seat, and water for washing feet, पूजयामास worshipped.

M N Dutt

And duly bending low in reverence, Vālmīki offered that deity water to wash his feet, and other things for reception.

Summary

Bowing with reverence as enjoined by tradition and having enquired of his well being, Valmiki worshipped the immutable Brahma by falling at his feet and welcoming him with a seat and water to wash his feet with.

पदच्छेदः

पूजयामास	पूजयामास (√पूजय् प्र.पु. एक.)
तं	तद् (२.१)
देवं	देव (२.१)
पाद्यार्घ्यासनवन्दनैः	पाद्य–अर्घ्य–आसन–वन्दन (३.३)
प्रणम्य	प्रणम्य (√प्र-नम् + ल्यप्)
विधिवच्	विधिवत् (अव्ययः)
चैनं	च (अव्ययः)–एनद् (२.१)
पृष्ट्वानामयम्	पृष्ट्वा (√प्रच्छ् + क्त्वा)–अनामय (२.१)
अव्ययम्	अव्यय (२.१)

छन्दः

अनुष्टुप् [८]

छन्दोविश्लेषणम्

१	२	३	४	५	६	७	८
पू	ज	या	मा	स	तं	दे	वं
पा	द्या	र्घ्या	स	न	व	न्द	नैः
प्र	ण	म्य	वि	धि	व	च्चै	नं
पृ	ष्ट्वा	ना	म	य	म	व्य	यम्